Regarding the bit about "millions of other people", it's not an entirely unfounded argument. We are social beings and the vast majority of our behavior is driven by leaning on the thoughts and experiences and pressures of others. It is impossible for an individual to logically reason about everything, and even if it were, it's a bit self centered to always consider your own reasoning to be supreme and that anyone who thinks otherwise is a fool. Unfortunately politicians and marketers take advantage of this social dynamic to mislead people but that doesn't mean that the wisdom of the group should be entirely thrown out.

To be specific to this particular issue, an example narrative to counter yours would be that the view of a single life and suffering is not taking into context the greater cycle of life in which we will be eaten by bacteria and in which a Jainist might find being eaten by a tiger a beautiful thing. We are base primates and are not so separate from the ecosystem and our drives as we'd like to believe. Now this is just an example of a reasoned counter argument that could possible underlie the collective subconsciously of the "millions", and isn't necessarily my own reasoning.